--- nebula-0.2.3/src/hash.h
+++ nebula-0.2.3/src/hash.h
@@ -24,7 +24,7 @@
 #if HAVE_CONFIG_H
 # include <config.h>
 #endif
-
+#include "sys/types.h"
 
 struct cluster;
 
--- nebula-0.2.3/src/spamsum.h
+++ nebula-0.2.3/src/spamsum.h
@@ -24,7 +24,7 @@
 #if HAVE_CONFIG_H
 # include <config.h>
 #endif
-
+#include "sys/types.h"
 
 char *spamsum(const u_char *in, size_t length, uint32_t bsize);
 uint32_t spamsum_match(const char *str1, const char *str2);
--- nebula-0.2.3/src/trie.h
+++ nebula-0.2.3/src/trie.h
@@ -24,6 +24,7 @@
 #if HAVE_CONFIG_H
 # include <config.h>
 #endif
+#include "sys/types.h"
 
 struct trie_node;
 typedef struct trie_node *trie;